Dynamic ComboBoxEditor Population

Dynamic ComboBoxEditor Population

Hello,

Having trouble populating a ComboBoxEditor in one cell based on the selection of a ComboBoxEditor value in another cell within the grid. For example, one cell contains a dropdown list of Categories and based on the selection the dropdown list in the next cell over should populate with the applicable Sub Categories. After the Category selection, if I click directly into the Sub Category dropdown list, the items associated with the previous Category selection remain. However, if I click into another non-Sub Category cell and then go back to the Sub Category cell, the correct list of items is displayed. I've tried these steps with different events "ActivatingControl", "GettingControlValue", etc.  Seems like it's a pretty straightforward sequence of events, but having trouble identifying the correct grid events to engage. Any help with this scenario will be appreciated. Thanks.